How Natural is Nature? The Effect of Burning on Presettlement Vegetation in West-Central Illinois

When the first Euroamericans arrived in North America, they thought they were seeing a “wilderness,” unaltered by human hands. However, they were actually seeing highly managed environments. Kilburn and Brugam examine the impact of the burning of forests and prairies by Native Americans on the plant species in west-central Illinois

Pre-settlement Vegetation of Greene, Jersey and Macoupin Counties along the Prairie/Forest Border in Illinois

The US Federal Government established the Public Land Survey (PLS) to survey federal land before sale to settlers in the early 1800’s. We used a Geographic Information System (GIS) and the PLS to explore the relationship among forests, fire frequency, topography, and soils in Greene, Jersey and Macoupin Counties in Illinois. The PLS data was digitized from microfiche copies of the survey in the Lovejoy Library at Southern Illinois University Edwardsville. The floodplains along the Illinois River supported a fire-intolerant forest of Salix sp., Populus deltoides, Acer spp., and Fraxinus spp. The floodplain is bordered by a line of bluffs which forms a region of broken topography supporting moderately fire tolerant species on alfisols. To the East is a region of mixed prairie and forest. The prairie was on flat mollisols where it was intermixed with the forest on and hillier slopes and alfisols. The forest areas supported highly fire tolerant forest trees with large diameters at large distances from survey points. Non-Metric Multidimensional scaling reveals a close relationship among topography, vegetation and soils. Forests were on hilly land. Prairies were located on level uplands where there were no firebreaks. Floodplains are just as level as prairies. They are also located on mollisols adjacent to the river. They are protected from fire by sloughs, swamps and lakes. The results of our study support the conclusion that topography and moisture is an important control on the geographical distribution of vegetation in the study area. These factors likely operated by controlling fire frequency

Pre-settlement Vegetation of Greene, Jersey and Macoupin Counties along the Prairie/Forest Border in Illinois

The US Federal Government established the Public Land Survey (PLS) to survey federal land before sale to settlers in the early 1800’s. We used a Geographic Information System (GIS) and the PLS to explore the relationship among forests, fire frequency, topography, and soils in Greene, Jersey and Macoupin Counties in Illinois. The PLS data was digitized from microfiche copies of the survey in the Lovejoy Library at Southern Illinois University Edwardsville. The floodplains along the Illinois River supported a fire-intolerant forest of Salix sp., Populus deltoides, Acer spp., and Fraxinus spp. The floodplain is bordered by a line of bluffs which forms a region of broken topography supporting moderately fire tolerant species on alfisols. To the East is a region of mixed prairie and forest. The prairie was on flat mollisols where it was intermixed with the forest on and hillier slopes and alfisols. The forest areas supported highly fire tolerant forest trees with large diameters at large distances from survey points. Non-Metric Multidimensional scaling reveals a close relationship among topography, vegetation and soils. Forests were on hilly land. Prairies were located on level uplands where there were no firebreaks. Floodplains are just as level as prairies. They are also located on mollisols adjacent to the river. They are protected from fire by sloughs, swamps and lakes. The results of our study support the conclusion that topography and moisture is an important control on the geographical distribution of vegetation in the study area. These factors likely operated by controlling fire frequency

Aquilegia, Vol. 17 No. 3, July-December 1993: Newsletter of the Colorado Native Plant Society

https://epublications.regis.edu/aquilegia/1068/thumbnail.jp

An investigation of the relation between the number of children and education in Italy

In this paper we have investigated the impact of the level of education on the number of children in Italy. We have selected 1,490 families from the 1997- 2005 Longitudinal Investigation on Italian Families (ILFI) dataset. Our dependent variable is represented by the number of children ever born to each respondent (and to his partner). Since the number of children ever born (CEB) is a count variable, we have implemented three empirical models: Poisson, Zero-Truncated Poisson and an Instrumental Variable Poisson, where grandparents’ education is exerted as an instrument of parents’ education. In particular, we have considered two stages for each model: in the first stage, we have estimated the impact of female’s education on her number of children, and in the second one, we have used also partner’s education to identify the previous effect. From the empirical results, we may observe a significant negative effect of the level of education on the number of children

Current State of the Science: Health Effects and Indoor Environmental Quality

Our understanding of the relationship between human health and the indoor environment continues to evolve. Previous research on health and indoor environments has tended to concentrate on discrete pollutant sources and exposures and on specific disease processes. Recently, efforts have been made to characterize more fully the complex interactions between the health of occupants and the interior spaces they inhabit. In this article we review recent advances in source characterization, exposure assessment, health effects associated with indoor exposures, and intervention research related to indoor environments. Advances in source characterization include a better understanding of how chemicals are transported and processed within spaces and the role that other factors such as lighting and building design may play in determining health. Efforts are under way to improve our ability to measure exposures, but this remains a challenge, particularly for biological agents. Researchers are also examining the effects of multiple exposures as well as the effects of exposures on vulnerable populations such as children and the elderly. In addition, a number of investigators are also studying the effects of modifying building design, materials, and operations on occupant health. Identification of research priorities should include input from building designers, operators, and the public health community

Comparing very low birth weight versus very low gestation cohort methods for outcome analysis of high risk preterm infants

Background: Compared to very low gestational age (\u3c32 weeks, VLGA) cohorts, very low birth weight (\u3c1500 g; VLBW) cohorts are more prone to selection bias toward small-for-gestational age (SGA) infants, which may impact upon the validity of data for benchmarking purposes. Method: Data from all VLGA or VLBW infants admitted in the 3 Networks between 2008 and 2011 were used. Two-thirds of each network cohort was randomly selected to develop prediction models for mortality and composite adverse outcome (CAO: mortality or cerebral injuries, chronic lung disease, severe retinopathy or necrotizing enterocolitis) and the remaining for internal validation. Areas under the ROC curves (AUC) of the models were compared. Results: VLBW cohort (24,335 infants) had twice more SGA infants (20.4% vs. 9.3%) than the VLGA cohort (29,180 infants) and had a higher rate of CAO (36.5% vs. 32.6%). The two models had equal prediction power for mortality and CAO (AUC 0.83), and similarly for all other cross-cohort validations (AUC 0.81-0.85). Neither model performed well for the extremes of birth weight for gestation (\u3c1500 g and ≥32 weeks, AUC 0.50-0.65; ≥1500 g and \u3c32 weeks, AUC 0.60-0.62). Conclusion: There was no difference in prediction power for adverse outcome between cohorting VLGA or VLBW despite substantial bias in SGA population. Either cohorting practises are suitable for international benchmarking